Station-selector dial for radio receiving sets



Jufly 5 1927. 19634 625 M. NYSTROM STATION SELECTOR DIAL FOR RADIORECEIVING SETS Filed July 25, 1925 2 Sheets-Sheet 1 CONDENSER CONDENSERI m wza 59 (19270 M. NYSTROM STATION SELECTOR DIAL FOR RADIO RECEIVINGSETS Filed July 25, 1925 2 Sheets-Sheet Z m llllll Illllllllflllll-l g 27 J2 \1 CONDENSER Patented. July '5, 1927. I

- UNITED STATES 1,634,625 PATENT orrlcs.

mam nxsrnou, or omcaeo, ILLINOIS, Assmiuon are THE nnUNswIox-BALxE-commnnnn comrm, orwxnmme'ron, DELAWARE, A CORPORATION or DELA- WABE.

srazrxon-snnnc'ron DIAL non RADIO nncnrvme sn'rs.

Application flled jJuly 25, 1925 Serial .No. 46,044.

This invention relates to station selector dials for radio receivingsets and its object is to provide a dial of simple construct on whichcan be easily manipulated to readily secure fine adjustments forselecting diflerent broadcasting stations, as desired.

In the accompanying drawings illustrating selected embodiments of, theinvention- Fig. 1 is a plan view showing a pair of stadenser, each ofthese condensers having ro-' tor plates mounted on rock shafts 11. Ihave not attempted to show the detail construetion of the condensersbecause they are familiar in the art and need no further description.Each condenser is supported on a frame 12 which is fastened to theinside of the instrument board 7 The shaft ll carries agear 13 whichmeshes with a gear-'14 on a sleeve 15 which is rotatably mounted on aspindle 16 rigidly secured in the frame 12. The sleeve 15'has a flange17 and a dial plate 18' is secured'to the flange by one. or more screws19' or other suitable means. A dial 19 is clamped against the dial plateby a disk 20, which is screw-threaded on the upper ,end of the sleeve 15An index plate 21 carrying a pointer 22 is rigidly secured in fixedposition on the reduced end 23 of the spindle 16, the outer portion ofthis reduced end being threaded to receive aclamping nut. 24. The indexplate has an aperture 25 with oppositely disposed extensions 26 toengage the spindle and a cross pin 27, carried by the spindle isarranged to engage the extensions 26 of the aperture to hold the indexplate in fixed position. -The dial 19 is held'in place on the dial plate18 by a spring ring 28 of usual constructiomwhich is sprung into agroove 29 formed in the upstanding peripheral Wall 30 of the dial plate.The

outer surface of this wall is preferably knurled or serrated orroughened to facilitate the operation thereof.

In practice the parts being arranged in the usual positionpthe dialplate 18 is manipu lated by turning it back and forth as required toselect a desired broadcasting station. The dial plate being fast to thesleeve, any movement of the dial plate is communicated to the rotorplates ofv the condenser through the condenser shaft and gearingintermediate of the shaftand the dial plate sleeve. The two dial plateswill be manipulated correspondingly to select a station in the usualmanner, and this form ofv station selector. dials will be found adaptedforstations will be greatly facilitated.

I am aware that changes in the form, proportion and arrangement of partsof the selected embodiment of the invention illustratedin the drawingsmay be made without departing from the invention or sacrificing theadvantages thereof, and I reserve the right to make all such changes asfairly fall within the scope of the following claims.

I claim:

1. A station selector dial for a radio re-.

the dial. a dial seated within the dialplate,

and an index pointer rigid with the spindle and projecting over saiddial.

2. A-station selector dial for a radio receiving set comprising a fixedspindle, a revoluble sleeve on the spindle, a flange on the sleeve, adial plate fastened to the flange, a dial on the dial plate,- a disk onthe sleeve clamping the dial against the dial plate, and a pointer rigidwith the spindle and projecting over the dial. i

3. A station selector dial for a radio receiving set comprising a fixedspindle, a revoluble sleeve on the spindle, a dial plate mounted on thesleeve to revolve therewith, a. peripheral wall on the dial plate andhavinga groove the outer, surface of said wall; being roughened,'a dialon said plate, a ring engaging said groove-and clamping the edge of thedial against the dial plate, a disk on the sleeve clamping the centralportion of the dial against the dial plate, and a pointer rigid with thespindle and projecting over the dial.

MARTIN NYSTROM.

' sensitive operation so that the selection of

